Those are some lucky students.
On Wed, Feb 26, 2020 at 5:18 PM Bev Christian <[log in to unmask]>
wrote:
> Doug,
> I will send you a presentation from the university course I teach at the
> University of Waterloo on Electronics Manufacturing. You have my permission
> to use as much or little as you chose. It is on CFC elimination,
> historical, yes, but an important part of the whole story.
>
> Regards,
> Bev
>
> -----Original Message-----
> From: TechNet <[log in to unmask]> On Behalf Of Douglas Pauls
> Sent: Wednesday, February 26, 2020 2:13 PM
> To: [log in to unmask]
> Subject: Re: [TN] [External] Re: [TN] Cleaning Course of Study
>
> So, what would be an excellent educational topic is how one would arrive
> at the optimal set of cleaning parameters for a product. Not all cleaning
> processes are created equal.
>
> *Douglas Pauls *| Principal Materials and Process Engr | Advanced
> Operations Engineering
>
> *COLLINS AEROSPACE*
>
> 400 Collins Road NE
> <https://www.google.com/maps/search/400+Collins+Road+NE?entry=gmail&source=g>,
> MS 108-101, Cedar Rapids, IA 52498 USA
>
> *Tel:* +1 319 295 2109 | *Mobile: *+1 319 431 3773
>
> [log in to unmask]
>
> [log in to unmask] for all Export Compliant Items
>
>
> On Wed, Feb 26, 2020 at 12:34 PM Stadem, Richard D <
> [log in to unmask]>
> wrote:
>
> > Well, there are batch cleaners, and there are batch cleaners.
> > I have a TDK inline cleaner here at GD, as well as four other batch
> > cleaners.
> > The Stoelting batch cleaner I use both here and in Norway are just
> > absolutely fantastic. They work really well, albeit they take a little
> > longer than the inline cleaner.
> > In my nature of work, operators do not get to pick and choose which
> > cleaning machine they get to use, however.
> > We use a saponified wash process in the batch cleaner at a 5% Bioact
> > terpene mix ratio for RMA cleaning, and it works extremely well.
> >
> > -----Original Message-----
> > From: TechNet <[log in to unmask]> On Behalf Of Watson, Howard August
> > Sent: Wednesday, February 26, 2020 11:40 AM
> > To: [log in to unmask]
> > Subject: Re: [TN] [External] Re: [TN] Cleaning Course of Study
> >
> > Dean,
> >
> > I like your ideas especially relating to batch cleaners. We got a
> > batch cleaner (closed loop) a few years ago, and I think that everyone
> > thought it was "plug and play". It didn't yield the results expected,
> > and so it just sat there unused. No one trusted it, so they went back
> > to solvent bench cleaning.
> >
> > Thanks,
> >
> > Howard A. Watson
> > __________________________________________
> > Intelligence & Space Research Division, ISR-5, TA-03-2322-504 Los
> > Alamos National Laboratory
> > 30 Bikini Atoll Road, MS B261
> > Los Alamos, NM 87545
> > Phone: 505-665-3402
> > [log in to unmask]
> >
> >
> >
> > -----Original Message-----
> > From: TechNet <[log in to unmask]> On Behalf Of Stadem, Richard D
> > Sent: Wednesday, February 26, 2020 9:56 AM
> > To: [log in to unmask]
> > Subject: Re: [TN] [External] Re: [TN] Cleaning Course of Study
> >
> > Some more:
> > How a typical DI tank farm or system works, maintenance of the DI
> > tanks, chemical treatment for microbial or bacterial issues with the
> > municipal water supply. (Ain’t I a fun gi?, LOL) Considerations for
> > water use, and the monitoring thereof.
> > Local environmental laws, regulations, and ordinances related to
> > release of wash water into municipal waste treatment systems, permits
> > required, COD testing or other waste testing that may be required, why
> > it is a good idea to establish a personal relationship with the local
> > environmental waste office and how they are a valuable resource in how
> > to deal with spent de-scaling compounds, etc.
> > How to safely dispose of salamander eggs, tadpoles, minnows, water
> > spiders, LSD, and prohibited weeds from the local water supply.
> >
> > Which brings me to Maintenance:
> >
> > Review of the cleaner’s maintenance program, is it up-to-date and is
> > it sufficient? Do the PM intervals make sense for daily, monthly,
> > yearly or semi-yearly procedures? Is it being performed as defined?
> > Does the machine require de-scaling periodically? Are safety
> > procedures in place that are applicable to Maintenance (tag-out,
> > power-down, personal protective equipment when working around chemical
> > de-scaling compounds and other chemicals, etc).
> > Proper documentation of daily mix verification or verification of
> > water pressure, water temperature, rinse temperature, belt speed, etc.
> >
> > I’ll keep thinking, I am sure there is more.
> >
> > Odin
> >
> >
> > From: Douglas Pauls <[log in to unmask]>
> > Sent: Wednesday, February 26, 2020 10:30 AM
> > To: TechNet E-Mail Forum <[log in to unmask]>; Stadem, Richard D <
> > [log in to unmask]>
> > Subject: Re: [External] Re: [TN] Cleaning Course of Study
> >
> > An excellent set of points. Thank you Odin. I especially like #5. A
> > corollary would be not to use the reflow oven as a pizza ove
> <https://www.google.com/maps/search/oven+as+a+pizza+ove?entry=gmail&source=g>
> n.
> >
> > Douglas Pauls | Principal Materials and Process Engr | Advanced
> > Operations Engineering COLLINS AEROSPACE
> > 400 Collins Road NE, MS 108-101, Cedar Rapids, IA 52498 USA
> > Tel: +1 319 295 2109 | Mobile: +1 319 431 3773 [log in to unmask]<
> > http://collins.com>
> > [log in to unmask]<mailto:
> > [log in to unmask]> for all Export Compliant Items
> >
> >
> > On Wed, Feb 26, 2020 at 10:27 AM Stadem, Richard D <
> > [log in to unmask]<mailto:[log in to unmask]>> wrote:
> > I think it is critical to train in the basic fundamentals, as applicable.
> > Handling after the wash is critical;
> >
> > 1. Ensure a good blow-off of any remaining water is performed, and
> > explain that even after a good wash and rinse, CCAs should never be
> > allowed to sit with standing water that can evaporate, leaving behind
> > white residue in the form of suspended flux particles, minerals, etc.
> > This is applicable to most in-line cleaners, perhaps not for many
> > batch (non-conveyor) cleaners which typically perform a drying
> > function within the chamber at the end of the final rinse. A good
> > blow-off or drying cycle takes any remaining contamination off of most
> of the CCA with the leftover water.
> > 2. Never package wet CCAs directly into closed ESD boxes, bags, or
> > other packaging. This ensures creep corrosion, etc., etc,.
> > 3. A section on saponifier mix verification, typically done with
> > in-situ process analyzers, or whatever method the saponifier
> > manufacturer recommends. Information on how the ventilation of the
> > cleaner can cause changing mix ratio levels, etc 4. Matching of the
> > cleaning process for the
> > flux(s) used. Considerations to be given to using batch cleaning with
> > an appropriate saponifier or solvent for non-water soluble fluxes, and
> > perhaps an in-line conveyorized machine for soluble. Or vice-versa,
> > dependent on the typical product mix.
> > 5. Why the cleaning process should ONLY be used for cleaning fluxes
> > and "normal" soils, and not for cleaning carburetors, smocks, removing
> > of the wrong adhesive (uncured), cleaning of newly-machined shop
> > fixtures/tools covered with silicone-bearing cutting grease or oils.
> > 6. Prevention of silicone contamination in general. Nothing like an
> > operator cleaning heatsink grease as part of a rework procedure to
> > screw up your wash process permanently. Just try coating boards after
> > they have been washed in a silicone-contaminated cleaner. Such fun!
> >
> > I will think of more, whether you like it or not, LOL!
> >
> > dean
> >
> >
> > -----Original Message-----
> > From: TechNet <[log in to unmask]<mailto:[log in to unmask]>> On Behalf Of
> > Douglas Pauls
> > Sent: Wednesday, February 26, 2020 6:43 AM
> > To: [log in to unmask]<mailto:[log in to unmask]>
> > Subject: [TN] Cleaning Course of Study
> >
> > Good morning Technetians
> >
> > OK, so I have been thinking (and we know how dangerous that is) about
> > developing a course of study for someone to become a "cleaning expert".
> > Something along the lines of starting with a new hire and educating
> > the new hires up to my level. Courses would include things like flux
> > chemistry, cleaning processes and chemistry, cleanliness measurem
> <https://www.google.com/maps/search/leanliness+measurem?entry=gmail&source=g>ent
>
> > methods, SIR methods, etc. What items would you suggest be added to the
> course of study?
> >
> > *Douglas Pauls *| Principal Materials and Process Engr | Advanced
> > Operations Engineering
> >
> > *COLLINS AEROSPACE*
> >
> > 400 Collins Road NE, MS 108-101, Cedar Rapids, IA 52498 USA
> >
> > *Tel:* +1 319 295 2109 | *Mobile: *+1 319 431 3773
> >
> > [log in to unmask]<mailto:[log in to unmask]>
> >
> > [log in to unmask]<mailto:
> > [log in to unmask]> for all Export Compliant Items
> >
>
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